<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
        var a = "123";
        var b = 123;
        alert(a == b); // true
        alert(a === b); // false
    </script>
</head>
<body>

</body>
</html>